RHEOSTATIC BRAKING PDF

Both are accomplished through the interactions of armature windings with a relatively moving external magnetic field, with the armature connected to an electrical circuit with either a power supply motor or power receptor generator. In dynamic braking, the traction motor is switched into the role of a generator by switching from a supply circuit to a receptor circuit while applying electric current to the field coils that generate the magnetic field excitation. The amount of resistance applied to the rotating shaft braking power equals the rate of electrical power generation plus some efficiency loss. That is in turn proportional to the strength of the magnetic field, controlled by the current in the field coils, and the rate at which the armature and magnetic field rotate against each other, determined by the rotation of the wheels and the ratio of power shaft to wheel rotation.

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By proper choice of r1, the maximum braking torque can be made to occur just before stopping. Plugging The Braking of Synchronous Motor by plugging has serious disadvantages. Very heavy braking current flows causing line disturbances. The torque is also not effective. However, if the motor is synchronous induction type it can be braked effectively by plugging only if the machine is working as an induction motor.

Energy Relations During Braking of Electric Motors In conventional methods of braking, such as rheostatic braking and plugging, it is necessary to know the energy wasted, so as to satisfactorily carry out the design of the braking equipment. When a shunt motor is braked dynamically using a resistance the energy dissipated in the resistance is equal to the K.

The extra energy drawn from the mains is due to the application of the voltage in the reverse direction. For a Braking of Synchronous Motor the energy dissipated during rheostatic braking Knowing the various torques occurring in the motor during dynamic braking the dynamic behaviour of the motor can be established.

Updated: October 8, — pm.

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Dynamic Braking or Rheostatic Braking of DC Motor

The motor now works as a generator, producing the braking torque. For the braking operation in Dynamic Braking, the motor is connected in two ways. Firstly the separately excited or shunt motor can be connected either as a separately excited generator, where the flux is kept constant. The second way is that it can be connected to a self-excited shunt generator, with the field winding in parallel with the armature.

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Dynamic braking explained

Dynamic braking explained Dynamic braking is the use of an electric traction motor as a generator when slowing a vehicle such as an electric or diesel-electric locomotive. It is termed "rheostatic" if the generated electrical power is dissipated as heat in brake grid resistor s, and " regenerative " if the power is returned to the supply line. Dynamic braking reduces wear on friction -based braking components, and regeneration lowers net energy consumption. Dynamic braking may also be used on railcar s with multiple unit s, light rail vehicle s, electric tram s, trolleybus es and electric and hybrid electric automobile s.

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Dynamic or Rheostatic Braking of Electric Motors

Vibar In electrified systems the process of regenerative braking theostatic employed whereby the current produced during braking rheostatic braking fed back into the power supply system for use by other traction units, instead of being wasted as heat. Views Read Edit View history. This is achieved by maximizing the dynamic brake portion, and automatically regulating the air brake rheostatic braking, as the main purpose of dynamic braking is to reduce the amount of air braking required. Stopping a train requires the dissipation of a lot of energy. In other projects Wikimedia Commons. About 75 percent of braking rheostatoc on the Atlantique is achieved by running the motors as generators and dissipating energy into rheostats, a process rheostatic braking rheostatic braking. The kinetic energy of the motor rotor and connected load is dissipated in a starting rheostat or a special braking rheostat, and a braking torque is produced on the shaft of the machine.

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